Apparatus for heating and cooling long cylindrical parts

ABSTRACT

An apparatus having at least two mechanisms for rotary conveyance of treated cylindrical articles through a multisectional furnace and a multisectional cooler. The mechanisms are mounted on frames between sections of the furnace and cooler. Each mechanism has a ring mounted rotatable with respect to its longitudinal axis on two rolls mounted in the frame. The ring longitudinal axis is angularly misaligned with respect to the apparatus longitudinal axis. The article being treated rests on the inner surface of the ring and is rotatively moved forward during rotation of the ring. The mechanisms are provided with means for fixing the ring in the axial direction.

United States Patent [1 1 Rogalsky et a1.

'[ May 28, 1974 1 APPARATUS FOR HEATHNG AND COOLING LONG CYLINDRICALPARTS [76] Inventors: Anatoly Viktorovich Rogalsky, ulitsa Chicherina22, kv. 8; Vitaly Mikhailovich Markevich, ulitsa Barkalskaya 11, kv.125; Georgy Naumovich Kheifets, ulitsa Kirova 8, kv. 29; JuryLeonidovich Zaichenko, ulitsa Karla Libknekhta 41, kv. 5; ValeryEfremovich Baburov, Prospekt Petrovskogo 10, kv. 3; Vladimir PetrovichPavlovsky, ulitsa Karla Libknekhta 7, kv. 5; Eduard Vasilievich Golban,ulitsa Artema 8, kv. 2; Leonid Naumovich Pechennik, Pereulok Ushinskogo8, kv. 2; Zakhar Osipovich Knyazhinsky, ulitsa Kirova 8, kv. 4, all ofDnepropetrovsk; Nikolai Alexandrovich Bogatov, ulitsa Komso-Molskaya 23,kv. 13, Volzhsk; ,1 ury lsaakovich Raichuk, ulitsa Gagarina 8, kv. 33,Dnepropetrovsk; Viktor Nikolaevich Zaritsky, ulitsa Karla Libnekhta 577,kv. 30, Dnepropetrovsk; Evgeny Fedorovich Grodzitsky, ulitsa Kosiora 37,kv. 1, Dnepropetrovsk, all of USSR.

[22] Filed: Aug. 31, 1972 [21] Appl. No.: 285,193

Primary ExaminerCharles .l. Myhre Assistant ExaminerTheophil W. Streu1e,Jr. Attorney, Agent, or Firml-lolman & Stem [57] ABSTRACT An apparatushaving at least two mechanisms for rotary conveyance of treatedcylindrical articles through a multisectional furnace and amultisectional cooler. The mechanisms are mounted on frames betweensections of the furnace and cooler.

Each mechanism has a ring mounted rotatable with respect to itslongitudinal axis on two rolls mounted in the frame. The ringlongitudinal axis is angularly misaligned with respect to the apparatuslongitudinal axis. The article being treated rests on the inner surfaceof the ring and is rotatively moved forward during rotation of the ring.

The mechanisms are provided with means for fixing the ring in the axialdirection.

2 Claims, 6 Drawing Figures PATENTEU HAY 2 8 I974 SHEEI 3 0f 4 memenm wI 3,812909 SHEET @HIF d APPARATUS FOR HEATING AND COOLING LONGCYLINDRICAL PARTS The invention relates to the production of pipes andtubes, and more particularly to the construction of an apparatus forheat treatment of pipes and tubes.

Well known in the art are various constructions of conveyor typeapparatus in which the part under treatment is rotably conveyed.

One commonly known apparatus comprises a multi sectional furnace, acooling means or sprayer arranged directly behind the furnace andcoaxially with it, and a conveying mechanism installed between thefurnace and cooling means sections (on platforms).

In this apparatus the conveying mechanism is made in the form of wheelpairs mounted at an angle to the pipe or tube longitudinal axis.

conventionally, the pipe or tube is positioned in the trough of thewheel pair.

Wheels of each pair are set on shafts of gearboxes or other means drivenby electric motors.

Due to the angle between the axes of wheels and part or tube beingconveyed the latter is rotatively moved forward as a result of therotation of wheels while being heated and cooled.

The prior art apparatus for heat treatment of pipes and tubes having aconveying mechanism of the type described above has a number ofdisadvantages.

The apparatus for heat treatment of tubes, as a rule, is designed foreffecting the treatment of pipes and tubes widely ranging in diameter.For example, it may be designed for treating electrically welded gaspipes with a diameter of 530 to 1,420 mm.

During rotary conveyance of pipes and tubes on pairs of wheels themovement stability ofpipes or tubes is determined by the depth to whichthe pipes are laid down in the wheel trough.

The pipes of smaller and larger diameter seat in the trough of wheelpairs at different height, i.e., with different angle of laying down. Asa result, the pipe of a larger diameter is positioned too high on thewheels, and the rotary conveyance becomes unreliable, since duringrotation the pipe may fall out of the wheels.

The realization of wheel mechanisms with the intercentre distanceadjustable at the furnace intersection platform in order to obtain asuitable trough for each particular pipe diameter is not easily feasibleand brings about many problems which make doubtful its purpose.Therefore, the conveyance of pipes and tubes having a wide range ofdiameters by means of wheel roller bed is difficult from the technicalpoint of view.

The arrangement of reducing gears and other mechanisms impartingrotation to wheels at the high temperature area deteriorates theiroperating efficiency, requires the provision of a special water systemfor cooling reducing gear cases, as well as ofa circulating liquidlubrication system.

The cumbersome construction of wheel pairs necessitates longer furnaceintersectional distances or plat forms, thus decreasing the furnaceefficiency and increasing the apparatus length.

It is an object of the invention to provide an apparatus for heating andcooling of long-sized cylindrical parts having a wide range ofdiameters.

Another object of the invention is to reduce the overall length of suchapparatus.

Still another object of the invention is to provide an apparatus whereinthe drives of mechanism for conveying parts are removed outside the hightemperature zone of the multisectional furnace.

These and other objects are attained in an apparatus for heating andcooling long-sized cylindrical parts comprising a conveyer barrel-typemultisectional furnace, a multisectional cooling means mounted coaxiallywith said furnace, and at least two mechanismsfor rotary conveyance ofparts under treatment through said furnace and said cooling means, saidmechanisms being mounted on frames between sections of said furnace andsaid cooling means, wherein, according to the invention, each of saidmechanisms for rotary conveyance of parts under treatment comprises aring mounted rotatable with respect to its longitudinal axis on at leasttwo rollers mounted in said frame, the longitudinal axis of said ringbeing angularly misaligned with respect to the apparatus longitudinalaxis, said parts under treatment resting on the inner surface of saidring and being moved rotatably forward during rotation of said ring,each of said mechanisms having means for fixing said ring in the axialdirection.

Such construction of. apparatus will ensure reliable conveyance of partsunder treatment with rapid rotation, reduce the length of furnaceinsectional platforms and permit the removal of the drives of conveyingmechanisms outside the high temperature zone of the apparatusmultisectional furnace.

In the apparatus according to the invention, mechanisms for rotaryconveyance may be arranged so that alternate centres of their rings maybe displacedin the horizontal plane to opposite directions with respectto the apparatus longitudinal axis, when viewed along the forward travelof parts under treatment.

Owing to this arrangement of conveying mechanisms their rings form agroove that prevents lateral swing of conveyed parts.

The present invention will now be explained in greater detail withreference to a particular embodiment thereof which is represented in theaccompanying drawings, wherein:

FlG. 1 shows a top view of the apparatus according to the invention;

FIG. 2 shows a general view of one furnace section with two mechanismsfor rotary conveyance of parts under treatment made in accordance withthe invention;

FIG. 3 shows a top view of a portion of the apparatus according totheinvention;

FIG. 4 shows a sectional view taken along lV-lV of FIG. 3;

FIG. 5 shows a top view of the apparatus with mechanisms for rotaryconveyance of parts under treatment illustrating the displacement ofring centres with respect to the apparatus longitudinal axis made inaccordance with the present invention;

FIG. 6 shows a sectional view taken along VI-Vl of FIG. 5.

Now referring to the figures, the apparatus comprises a conveyerbarrel-type multisectional furnace 1 (FIG. 1) and a multisectionalcooling means 2 which may be of a sprayer type. Mechanisms 3 for rotaryconveyance of cylindrical parts 4 being treated are arranged betweensections of furnace l and cooling means 2.

Each mechanism 3 comprises a multiple-piece ring 5 (FIG. 2) resting onrolls 6 whose shafts are fixed in frame 7. Rollers 8 are mounted onframe 7. Rolls 6 and.

It should be understood that other drives differing from the onedescribed above may be used for imparting rotation to ring 5. Forexample, ring 5 can be rotably driven by support rolls 6 coupled withrotary drive 16 (H6. 3).

it should be also noted that rollers 17 (FIGS. 3, 4) mounted on frame 7diametrically at two opposite sides of ring 5 may be used for fixingring 5 in the axial direction instead of collar rims 9 (FIG. 2).

Mechanisms 3 for rotary conveyance of parts 4 under treatment may beinstalled'in the apparatus so that centers of rings 5 (H6815, 6) arealternatively displaced in the horizontal plane to opposite directionswith respect to the apparatus longitudinal axis along the forward travelof treated part 4.

When such arrangement ofrmechanisms 3 is employed, rings 5 form a groovewhich prevents lateral swing of parts 4 going therethrough.

The operation of the apparatus according to the invention is as follows.

At the initial stage, prior to feeding parts 4 to be treated into theapparatus, multisectional furnace 1 (H6. 1) is heated to the desiredtemperature, and cooling means 2 is supplied with cooling agent. Drives12 for rotating rings 5 of mechanisms 3 are started.

Parts 4 to be treated, such as electrically welded gas pipes havinglarge diameter, one by one are. fed to charging roller conveyer 18 whichhandles parts 4 while imparting rotation thereto into multisectionalfurnace 1.

Parts 4 resting on the inner surface of rotary rings 5 whoselongitudinal axes are angularly disposed with respect to the apparatuslongitudinal axis are rotatively moved forward thus going throughfurnace l where they are uniformly heated to the temperature required bythe heat treatment technology.

in operation of the apparatus, rotating ring 5 which encompasses'part4under treatment is supported by rolls 6 whose shafts are fixed in frame7. The axial fixing of rotary ring 5 is ensured either by collar rims 9of rolls 6 extending into the annular recess of ring 5 or by rolls l7.

The heated pipe continuing rotation around its axis enters cooling means2 which, for example, may be used for hardening purposes. Between thesections of this cooling means mechanisms 3 are also mounted whereby thetreated part 4 is still rotatively conveyed through the cooling means.

After cooling under the pre-set conditions in cooling means 2, parts 4leave the apparatus and are fed by discharging roller conveyer 19 forfurther technological steps. 7

It should be mentioned that when mechanisms 3 are installed in theapparatus so that the centres of their rings 5 (FIGS. 5, 6) areangularly displaced in the horizontal plane to opposite directions withrespect to the apparatus longitudinal axis in an alternate manner alongthe forward travel of treated parts 4, the heat treatment technologicalsteps are carried out in the same sequence as described above.

The use of the apparatus for heating and cooling long-size cylindricalparts of the construction described above and made in accordance withthe invention will provide for:

Higher reliability of conveyance with rapid rotation of long-sizedcylindrical parts widely ranging in diameter and uniform heating andcooling these parts in the apparatus.

Shorter length of unheated portions of multisectional furnace orplatforms where conveying mechanisms are installed whereby partialcooling of parts under treatment can be reduced and an increase in theapparatus production capacity may be achieved.

Longer service life of drive mechanisms due their removal outside thehigh temperature zone of the apparatus multisectional furnace.

We claim:

1. An apparatus for heating and cooling long-sized cylindrical partsincluding a conveyer barrel-type multisectional furnace; amultisectional cooling means mounted coaxially with the longitudinalaxis of said multisectional furnace; at least two frames, beinginstalled between a section of said furnace and said cooling means; atleast two rolls mounted in each of said frames, at least two mechanismsfor rotary conveyance of parts under treatment through said furnace andsaid cooling means, said mechanisms being mounted on said frames, eachof said mechanisms comprising a ring mounted rotatable with respect toits longitudinal axis on said rolls; the longitudinal axis of said ringbeing angularly misaligned with respect to the apparatus longitudinalaxis, said parts under treatment resting on the inner surface of saidring and being rotatively moved forward duringrotation of said ring; andmeans for axial fixing of said ring, said means being provided in eachof said .mechanisms for rotary conveyance of parts under treatment.

2. An apparatus as in claim 1 wherein said mechanisms for rotaryconveyance of parts under treatment through the apparatus are mounted sothat the geometrical centers of said rings are alternatively displacedin the horizontal plane in opposite directions from said apparatuslongitudinal axis along the forward travel of treated parts.

1. An apparatus for heating and cooling long-sized cylindrical partsincluding a conveyer barrel-type multisectional furnace; amultisectional cooling means mounted coaxially with the longitudinalaxis of said multisectional furnace; at least two frames, beinginstalled between a section of said furnace and said cooling means; atleast two rolls mounted in each of said frames, at least two mechanismsfor rotary conveyance of parts under treatment through said furnace andsaid cooling means, said mechanisms being mounted on said frames, eachof said mechanisms comprising a ring mounted rotatable with respect toits longitudinal axis on said rolls; the longitudinal axis of said ringbeing angularly misaligned with respect to the apparatus longitudinalaxis, said parts under treatment resting on the inner surface of saidring and being rotatively moved forward during rotation of said ring;and means for axial fixing of said ring, said means being provided ineach of said mechanisms for rotary conveyance of parts under treatment.2. An apparatus as in claim 1 wherein said mechanisms for rotaryconveyance of parts under treatment through the apparatus are mounted sothat the geometrical centers of said rings are alternatively displacedin the horizontal plane in opposite directions from said apparatuslongitudinal axis along the forward travel of treated parts.